illabile
/ɪˈleɪbɪl/ i-LAY-bil
Definitions
1. adjective
Not capable of being spoken or uttered; unspeakable.
“The horror of the event was illabile, making it difficult for anyone to put into words.”
2. noun
Something that is impossible to express or describe.
“The beauty of the sunset was an illabile experience that cannot be captured in words.”